48Ls Vs 53Ls Graph 02

48Ls Vs 53Ls Graph 02

14. 5.3L Stock vs. Modified the results were nearly identical on the slightly larger 5.3L. In stock trim, the 5.3L produced 344 hp at 5,100 rpm and 379 lb-ft of torque at 4,300 rpm. After adding the same TEA heads, Crane 224/232 cam and Fast LSXRT intake, the peak power numbers jumped to 484 hp at 6,800 rpm and 424 lb-ft at 5,700 rpm. Like the 4.8L, the 5.3L lost no power even down at 3,000 rpm, but the gains exceeded 150 hp past 6,000 rpm.